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CHCS ES Ch2A

CHCS Earth Science Chapter 2 (p 29-31)

Question

Answer

theory

a hypothesis that has been tested and is a workable description of a phenomenon

law

a scientific theory that has become well established because it has been repeatedly confirmed by experimentation, has made many accurate predictions, or is readily accepted by the majority of scientists

geocentric theory

AKA Ptolemaic Theory; has earth as at the center of the solar system

eccentric

"off center" circle

retrograde motion

the optical illusion that some planets slow down, stop, and back up in their orbits

epicycles

small circles that were added to the geocentric theory to explain retrograde motion

deferent

crystal spheres that moved around earth, each having a planet, the moon , or the sun